1. 'Iron Man' (2008): The Nick Fury Reveal
As Marvel's introduction to the world of the Avengers, Iron Man was a huge success. The DNA of Marvel's mega-franchise strategy was all in that one movie, complete with a post-credits reveal that teased bigger things to come. As Tony Stark walks through his dimmed home, his AI, Jarvis, shuts down and Tony sees the trench-coated silhouette of Nick Fury. "You think you're the only superhero in the world?," he asks. "Mr. Stark, you've become a part of a bigger universe. You just don't know it yet."